of quebec



(Mode.) I

D. S. ROBILLIARD.

\ y LOW PRESSURE BOILEB. No. 805,848. Patented Sept. 80, 1884.

2159.1. Y la! i Y z e e L' L A 'l I I l QL a, :1 /l, f "'1 #7L ai..

L c a s V i I a; n if Y ",.SA'

WITNESSBS 8 INVENTOR ATTORNEYS.

' @UNITED STATES trice.-

Low-PRESSURE eolLER.

SPECIFICATION forming part of Letters Patent No. 305,848, dated September 30, 3.884. nppiiciiiion tied April sofiesi. (nous.)

To alt whom it may concern.-

Be itv known that I, DANIEL S. ROBILLIARD,

i 1o signed for simplicity and cheapness of construction and for econornizing fuel, as hereinafter fully described.

Reference is to be had to the accompanying drawings, forming part of this specification, i in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is aside elevation of my improved boiler. Fig. 2 is a frontelevation. Fig. 3 is a longitudinal sectional elevation, and Fig. 4 is a transverse sectional elevation.

I make the water-holding part of the boiler to consist of a series ofY hermeticallymlosed parallel side sections of either cast metal or boiler-plate, and of` different dimensions, according to their position in the boiler, and arrange and connect said sections together by setting up two sections, a, edgewise along the sides of the refgrate b on the top plates, c, of a suitable supporiingbase, d, and arranging 3Q three (more or less) sections, e f g, horiron` tally over the dre-space, and one above an other, with spaces between them about equal to the thickness of the sections. The lower section, e, is sufficiently narrow to leave fluespaces zbetween its edges and the sides of sections a between which said section e is located. The intermediate section, f, is located above the sections a. e, and is wider than section e, but is arranged with relation to .the 4 0 sides t' of the jacket by-which the whole is inclosed to provide flue-spaccsj along its edges; but the top section, g, is the full width of the inclosing-jacket, and is located directly under the cover k of said case. Sections c are connected to section e by, say, two horizontal circulatingtubes, Z, to each, and they are also connected by four vertical tubes, m, each toy the top section, y, to which latter the intermediate section, f, is also connected by four tubes, 5o n, along the center, and section e is similarly connected by fourd tubes, o, to section f. The

steam or hot water iiows away through the and returns to the sections a by the pipes p. The flue-spaces h are covered by A-shaped ueplates @that deflect the heat onto the top of sections ,to cause it to impinge effectually thereon before ascending through the passages 's of plates q,\vhich direct the heat against the center of section f effectually. The heat-cub rents divide underthe center of section f, and are caused to impinge the bottom more intimately in passing over the angles of the flueplates q, from which they pass up flue-spaces j, around the edges of section f, to the deflecting flue-plates t, which turn them down on the top of section f, from which they pass 'through the openingsa of plates tinto the space under and against the bottom of the top section, g, from which they pass away into the smokepipe fo, after impinging directly on the bottoni of section g, and thus effectually giving up the heat, so as to materially economize the fuel.

For effectin g automatic regulation of the fire bythe use of thermostatic levers w and chains m to control the draft, I propose to construct the ash-pit door a and the dre-box door b' each with a valve, c', hinged to said doors at d', and iitted to close on sloping seats c', so that they will be opened by the lift of the levers w when raised'by the heat, and will close on said sloping seats by gravity when the heat subsides and the levers fall.

The doors c and b are hinged in the ordi# l nary manner at f', to be swung open laterally by hand.

The boiler will have the usual glass watergage g', pressure-gage h', and safety-valve t.

The inclosingjacket may be made of cast metal or rolled plates, as preferred, and will be connected at the joint-s by lugs j" and bolts or screws, as preferred. l

Having thus described my invention, I claim as new and desire to secure by Letters Patent-` 1. The combination, in aboiler for steam or ,hot water, 0f two vertical water-sections, a, forming the sidesof the fuel-box, also three (more or less) longitudinal water-sections, cf g, arranged over the fire-space within an inclosing-jacket, t' k, and also circulating-tubes l, m, o, and n, connecting said sections, the top section, g, having the stean1-pipes p, and sections ci having the return-pipes p', substantially as described.

IOO

` 1o the horizontal water-sections f g, having flues j, and the smoke-pipe o, said plates t being arranged to project the heat downward on. the upper side of section f and upward against the bottom of section g, substantially as de- 15 scribed.

4. The combination of the vertical and hori zontal water-'sections a, @,f, and g, circulatingtubes Z, m, 0, and n, fine-plates q and t, and an inclosingjacket, ik, substantially as described.

5. The combination of the base d, having 2o top plates, c, and the case i k, with the Vertical and horizontal water-sections a, e, f, and g, circulating-tubes l, m, o, and n, and lueplates q and t, said water-sections being arranged with ilues h and j, substantially as de- 25 scribed.

DANIEL SEBIRE ROBILLIARD. Vitnesses:

FREDERICK WM. ANDREWS,

C. J. S. NUEEINGTON. 

